They do but unofficially though. Their Japanese concerts usually have two teams performing: vocal unit and rap unit. Believe me when I say the rap unit PWNS over the vocal unit (or maybe that's just my AJ-biased side speaking lol).

It's so so beautiful although the ~slow~ rap parts were kinda laughable. xD Glad they put the 'fierce' rap near the end of the song. :3

Man, I don't think I will ever get over them if they keep releasing good stuffs like this. I love their near perfect Japanese pronunciations. ^^; People can say many things about them but it doesn't take away the fact that these guys consistently produce amazing music. :D

I actually thought I heard AJ's voice in the rapping part in the middle of the song but it was Dongho. And yes, that awesome, flawless (I'm just being biased here) needs to come back soon. The band looks empty without him.